diff --git a/examples/others/raymath_vector_angle.c b/examples/others/raymath_vector_angle.c index b193648fe513..ab8ccf571a2d 100644 --- a/examples/others/raymath_vector_angle.c +++ b/examples/others/raymath_vector_angle.c @@ -2,7 +2,7 @@ * * raylib [shapes] example - Vector Angle * -* Example originally created with raylib 1.0, last time updated with raylib 4.2 +* Example originally created with raylib 1.0, last time updated with raylib 4.6 * * Example licensed under an unmodified zlib/libpng license, which is an OSI-certified, * BSD-like license that allows static linking with closed source software @@ -10,7 +10,7 @@ * Copyright (c) 2023 Ramon Santamaria (@raysan5) * ********************************************************************************************/ - + #include "raylib.h" #include "raymath.h" @@ -28,7 +28,7 @@ int main(void) InitWindow(screenWidth, screenHeight, "raylib [math] example - vector angle"); Vector2 v0 = { screenWidth/2, screenHeight/2 }; - Vector2 v1 = { 100.0f, 80.0f }; + Vector2 v1 = Vector2Add(v0, (Vector2){ 100.0f, 80.0f }); Vector2 v2 = { 0 }; // Updated with mouse position float angle = 0.0f; // Angle in degrees @@ -42,21 +42,29 @@ int main(void) { // Update //---------------------------------------------------------------------------------- + float startangle; + + if (angleMode == 0) startangle = -Vector2LineAngle(v0, v1)*RAD2DEG; + if (angleMode == 1) startangle = 0.0f; + + v2 = GetMousePosition(); + if (IsKeyPressed(KEY_SPACE)) angleMode = !angleMode; + if(angleMode == 0 && IsMouseButtonDown(MOUSE_BUTTON_RIGHT)) v1 = GetMousePosition(); + if (angleMode == 0) { // Calculate angle between two vectors, considering a common origin (v0) - v1 = Vector2Add(v0, (Vector2){ 100.0f, 80.0f }); - v2 = GetMousePosition(); - angle = Vector2Angle(Vector2Normalize(Vector2Subtract(v1, v0)), Vector2Normalize(Vector2Subtract(v2, v0)))*RAD2DEG; + Vector2 v1Normal = Vector2Normalize(Vector2Subtract(v1, v0)); + Vector2 v2Normal = Vector2Normalize(Vector2Subtract(v2, v0)); + + angle = Vector2Angle(v1Normal, v2Normal)*RAD2DEG; } else if (angleMode == 1) { // Calculate angle defined by a two vectors line, in reference to horizontal line - v1 = (Vector2){ screenWidth/2, screenHeight/2 }; - v2 = GetMousePosition(); - angle = Vector2LineAngle(v1, v2)*RAD2DEG; + angle = Vector2LineAngle(v0, v2)*RAD2DEG; } //---------------------------------------------------------------------------------- @@ -66,32 +74,40 @@ int main(void) ClearBackground(RAYWHITE); - if (angleMode == 0) DrawText("v0", v0.x, v0.y, 10, DARKGRAY); - DrawText("v1", v1.x, v1.y, 10, DARKGRAY); - DrawText("v2", v2.x, v2.y, 10, DARKGRAY); - if (angleMode == 0) { - DrawText("MODE: Angle between V1 and V2", 10, 10, 20, BLACK); + DrawText("MODE 0: Angle between V1 and V2", 10, 10, 20, BLACK); + DrawText("Right Click to Move V2", 10, 30, 20, DARKGRAY); DrawLineEx(v0, v1, 2.0f, BLACK); DrawLineEx(v0, v2, 2.0f, RED); - float startangle = 90 - Vector2LineAngle(v0, v1)*RAD2DEG; - DrawCircleSector(v0, 40.0f, startangle, startangle + angle - 360.0f*(angle > 180.0f), 32, Fade(GREEN, 0.6f)); + DrawCircleSector(v0, 40.0f, startangle, startangle - angle, 32, Fade(GREEN, 0.6f)); } else if (angleMode == 1) { - DrawText("MODE: Angle formed by line V1 to V2", 10, 10, 20, BLACK); + DrawText("MODE 1: Angle formed by line V1 to V2", 10, 10, 20, BLACK); DrawLine(0, screenHeight/2, screenWidth, screenHeight/2, LIGHTGRAY); - DrawLineEx(v1, v2, 2.0f, RED); + DrawLineEx(v0, v2, 2.0f, RED); - DrawCircleSector(v1, 40.0f, 90.0f, 180 - angle - 90, 32, Fade(GREEN, 0.6f)); + DrawCircleSector(v0, 40.0f, startangle, startangle - angle, 32, Fade(GREEN, 0.6f)); } + DrawText("v0", v0.x, v0.y, 10, DARKGRAY); + + // If the line from v0 to v1 would overlap the text, move it's position up 10 + if (angleMode == 0 && Vector2Subtract(v0, v1).y > 0.0f) DrawText("v1", v1.x, v1.y-10.0f, 10, DARKGRAY); + if (angleMode == 0 && Vector2Subtract(v0, v1).y < 0.0f) DrawText("v1", v1.x, v1.y, 10, DARKGRAY); + + // If angle mode 1, use v1 to emphasize the horizontal line + if (angleMode == 1) DrawText("v1", v0.x + 40.0f, v0.y, 10, DARKGRAY); + + // position adjusted by -10 so it isn't hidden by cursor + DrawText("v2", v2.x-10.0f, v2.y-10.0f, 10, DARKGRAY); + DrawText("Press SPACE to change MODE", 460, 10, 20, DARKGRAY); - DrawText(TextFormat("ANGLE: %2.2f", angle), 10, 40, 20, LIME); + DrawText(TextFormat("ANGLE: %2.2f", angle), 10, 70, 20, LIME); EndDrawing(); //---------------------------------------------------------------------------------- diff --git a/src/raymath.h b/src/raymath.h index db04c51ee3ec..b01b0b22bb7c 100644 --- a/src/raymath.h +++ b/src/raymath.h @@ -323,6 +323,8 @@ RMAPI float Vector2Angle(Vector2 v1, Vector2 v2) float dot = v1.x*v2.x + v1.y*v2.y; float det = v1.x*v2.y - v1.y*v2.x; + + // TODO(10/9/2023): Currently angles move clockwise, determine if this is wanted behavior result = -atan2f(det, dot); return result; @@ -335,7 +337,8 @@ RMAPI float Vector2LineAngle(Vector2 start, Vector2 end) { float result = 0.0f; - result = atan2f(end.y - start.y, end.x - start.x); + // TODO(10/9/2023): Currently angles move clockwise, determine if this is wanted behavior + result = -atan2f(end.y - start.y, end.x - start.x); return result; }